Future Me - Send an email to your future self

Thyself - Mindful mood tracking for greater self-awareness

Dabble Me - Your own private place to write. A journal/diary to help you remember what's happened in your life.

Lemoon - Stay on top of your depression

Letter to my future self - Letter to my future self is a prominent email scheduling service that gives you the opportunity to create a letter with goals and thoughts for your future self and schedule a date for sending it.

Nomie - Open-source mood and life tracking